Soft VoIP

Started by Anonymous in comp.arch.embedded13 years ago 13 replies

Hi, Is it OK to implement VoIP protocol merely by an 8 bit MCU and an ethernet chip? The MCU speed is less than 10MHz. Or I need stronger...

Hi, Is it OK to implement VoIP protocol merely by an 8 bit MCU and an ethernet chip? The MCU speed is less than 10MHz. Or I need stronger MCU such as ARM? Thanks!


Update freescale HC08 MCU in run-time.

Started by Boki in comp.arch.embedded11 years ago 8 replies

Hi All, That MCU in my circuit, after product housing, I still want to let user can upgrade the MCU firmware through USB... Any commnet? My...

Hi All, That MCU in my circuit, after product housing, I still want to let user can upgrade the MCU firmware through USB... Any commnet? My main chip is a Bluetooth chip. Best regards, Boki.


help with finding a MCU

Started by bojal204 in comp.arch.embedded10 years ago 2 replies

Hi i am looking for a simple 16-bit MCU with embedded Ethernet MAC. I want to be able to print a menu screen on a crt monitor also. The MCU is...

Hi i am looking for a simple 16-bit MCU with embedded Ethernet MAC. I want to be able to print a menu screen on a crt monitor also. The MCU is going to be connected to a Q-bus. I need 16 I/O:s for the data/adress bus and 7 control signals. Anyone got some ideas? Regards Bojan


Problem with I2C

Started by galapogos in comp.arch.embedded11 years ago 38 replies

Hi, I'm trying to interface a Toshiba 16bit MCU with another IC(call this IC2), with the MCU being a slave transmitter. The IC2 expects a...

Hi, I'm trying to interface a Toshiba 16bit MCU with another IC(call this IC2), with the MCU being a slave transmitter. The IC2 expects a slave EEPROM at a certain address, and I've setup the MCU to be at this address. The problem is that the MCU isn't interrupting or acknowledging the signals all the time. I've looked at the SDA/SCL waveforms and while IC2 is sending the first device addre...


MCU to bluetooth

Started by Andrei Bejenari in comp.arch.embedded13 years ago 1 reply

Hello, I would like to make communicate a MCU with a PC via bluetooth. I'm looking for information on interfacing a MCU to bluetooth. Can...

Hello, I would like to make communicate a MCU with a PC via bluetooth. I'm looking for information on interfacing a MCU to bluetooth. Can you suggest me some links on implementing such an interface? Many thanks, ab


Need recommend a MCU that is to creat jpg file.

Started by Boki in comp.arch.embedded11 years ago 9 replies

Dear All, Looking for a suitable MCU. For create jpg file. The MCU will collect "RAW" data ( point[1] (x,y) = 10,10 ; point[2] (x,y) =...

Dear All, Looking for a suitable MCU. For create jpg file. The MCU will collect "RAW" data ( point[1] (x,y) = 10,10 ; point[2] (x,y) = 20,20 ........ ) from UART. Each pair of data means a (x,y) point. ( and I want to draw it as black in screen) So, the MCU will collect the information. ( of course, need some basic protocol control, but I think it doesn't cost too many MIPS ) So,...


HCS12 microcontroller question

Started by panfilero in comp.arch.embedded11 years ago 50 replies

Hello, I just got a MC9S12NE64 microcontoller and a development board, and I've been trying to access my microcontroller through...

Hello, I just got a MC9S12NE64 microcontoller and a development board, and I've been trying to access my microcontroller through the hyperterminal on my computer but have been having a really hard time. I couldn't find any serial port driver files for this MCU, but had some for a MC9S12C32 which i tried to modify to use with my MCU... my code compiles on codewarrior and loads into my MCU but....


H8SX/1721 MCU - reading/writing eeprom

Started by Who in comp.arch.embedded6 years ago 1 reply

Hello, I have couple of those MCU's that I would like to read and program... Is there any cheap programmer that handle those ? Jtag maybe and...

Hello, I have couple of those MCU's that I would like to read and program... Is there any cheap programmer that handle those ? Jtag maybe and some application that can read/write eeprom on this mcu ? I know that there is P&E Microcomputer Systems - Cyclone for Renesas But this price for a hobbyist is to expensive. Thank's for all the help. -------------------------------...


Simple & small MCU with 4 UARTS

Started by eliben in comp.arch.embedded9 years ago 23 replies

Hello, This question comes up from time to time, and I want to see if there's anything new in the offerings. I need an MCU with 4 UART (@...

Hello, This question comes up from time to time, and I want to see if there's anything new in the offerings. I need an MCU with 4 UART (@ 38.4 KBaud each) and several IOs. The 4 UARTs is a problem, because the simplest MCUs (PIC, AVR) don't have chips with this amount (AFAIK). I've seen various suggestions: 1) Use a different MCU (Renesas, Freescale), etc. I'm reluctant to do it, b...


MCU with CANbus + 10-bit ADC

Started by Mochuelo in comp.arch.embedded11 years ago 24 replies

Hi, Which is the cheapest MCU that you know of, with (Flash) AND (CANbus) AND (10-bit ADC) AND (EEPROM OR I2C)? Is there any web page with...

Hi, Which is the cheapest MCU that you know of, with (Flash) AND (CANbus) AND (10-bit ADC) AND (EEPROM OR I2C)? Is there any web page with a database where I can look for an MCU with a certain set of characteristics? It should cover as many manufacturers as possible. Thanks in advance,


32-bit MCU-family inquiry

Started by P_B in comp.arch.embedded6 years ago 25 replies

Hi everyone! This is my first post here :) I'm interested in making a platform which has an 32-bit MCU as the central component. This...

Hi everyone! This is my first post here :) I'm interested in making a platform which has an 32-bit MCU as the central component. This platform is supposed to be configurable, i.e. do things that an 8-bit MCU can handle OR do more advanced signal processing. What I have come up with is ARM Cortex M. From what I've read on the internet is that NXP has pin- & software-compatible devices in Co...


Do you see any future to the 8-bit MCU's?

Started by in comp.arch.embedded6 years ago 65 replies

Hi, During the latest months I have been receiving offers for 32-bit MCU's, mos= tly based on ARM-Cortex CPU's, at prices I'm currently paying...

Hi, During the latest months I have been receiving offers for 32-bit MCU's, mos= tly based on ARM-Cortex CPU's, at prices I'm currently paying for 8-bit dev= ices, or even cheaper! This has brought me to benchmark them with the MCU i= ndependent part of my C++ code and surprisingly the results are quite simil= ar. Same price, same flash consumption ... what do yo think? Is this the end o...


Automotive temp MCU

Started by Ralph Malph in comp.arch.embedded13 years ago 37 replies

I am looking at replacing several hardware chips with an MCU. I considered this once before but was looking for a lot more in the way of IO...

I am looking at replacing several hardware chips with an MCU. I considered this once before but was looking for a lot more in the way of IO than I am now. Also, this time the MCU has to operate over the full automotive temp range of -40 to +125C. I have looked at several manufacturers web sites, but they typically don't include temperature range in the guides. So I have to pick the dozen ...


MCU dead due to bad code?

Started by Anonymous in comp.arch.embedded11 years ago 9 replies

Hi everybody! I have some trouble with the OKI 675001: I'm using this part now for about 3 month, debugging and programming an extern Flash...

Hi everybody! I have some trouble with the OKI 675001: I'm using this part now for about 3 month, debugging and programming an extern Flash (AM29LV320) via JTAG. Never had any problems. Now after changing the code and burning it as usual into the FlashROM the MCU is no longer responding to JTAG. Furthermore no activity on the MCU bus. OK, i thought that some ESD distroyed the MPU and took a ...


8051 Port2 power consumption

Started by hhanff in comp.arch.embedded11 years ago 2 replies

Hi, I am using a C8051F311 MCU (Silicon Laboratories) and have connected P2(0:4) to +3.3V (+Vcc) via a DIP switch. When I close all 4...

Hi, I am using a C8051F311 MCU (Silicon Laboratories) and have connected P2(0:4) to +3.3V (+Vcc) via a DIP switch. When I close all 4 switches, the MCU consumes so much power that my voltage regulator (a 78M33) goes into thermal protection and switches off for some microseconds which resets the MCU. P2 is configured as digital input. Why is so much power consumed? Where is my mistake??? Th...


Display monitor for use with MCU

Started by anasimtiaz in comp.arch.embedded6 years ago 15 replies

Hi all, I have a setup of msp430 mcu currently that samples ECG data, does the necessary processing and serially transmits it to a computer for...

Hi all, I have a setup of msp430 mcu currently that samples ECG data, does the necessary processing and serially transmits it to a computer for display. I want to get rid of the computer here and use a small portable display for resulting ECG that can be interfaced with (any) MCU. I tried Googling for the options but couldn't find anything useful. Can anyone point me in the right direction ...


5V EPROM read/write from 3V mcu

Started by abrous in comp.arch.embedded7 years ago 10 replies

Hi guys, I have an application in which I have to read / write data to an 5V OTP EPROM (AT27c020) from an MCU. I have done this many times in...

Hi guys, I have an application in which I have to read / write data to an 5V OTP EPROM (AT27c020) from an MCU. I have done this many times in the past from 5V microcontrollers like ATmega128. Now I want to do the same from a 3V device (LM3S9B90). MCU inputs are 5V tolerant. I don't want to use 3V EPROMS since they are rare. Also I don't want to use level shifters since they increase cost and bo...


Defining the endianness for arm7 MCU

Started by Daniel in comp.arch.embedded13 years ago 2 replies

Hi there, I am struggling with a problem on my lh75411 MCU (arm7) which concerns the endianness. I observed that the endianness changes...

Hi there, I am struggling with a problem on my lh75411 MCU (arm7) which concerns the endianness. I observed that the endianness changes sometimes when uploading a srec file after reset to the MCU. I am using the following script for the M*craigor OCD tool: conn endian little CPSR = 0x13 r13 = 0x2100 r14 = 0x2200 byte 0xfffe2008 = 0x01 word 0xfffe5000 = 0x00005B3F wor...


MCU + USB

Started by Mochuelo in comp.arch.embedded12 years ago 14 replies

Hi, I don't know if there is a better group to ask about USB. I want to create a device that will communicate with a PC via USB. I prefer...

Hi, I don't know if there is a better group to ask about USB. I want to create a device that will communicate with a PC via USB. I prefer USB to RS232 because I plan to power the device from the USB supply. I guess I have (at least) two options: 1) I use an MCU with integrated USB interface. 2) I use any MCU, plus an FTDI FT232R (USB-UART device), or equivalent. Option 2 makes pro...


Hardware (FPGA) Software(MCU) Interface

Started by ratemonotonic in comp.arch.embedded10 years ago 1 reply

Hi all , Can any one tell me a generic pattern to designing an interface between MCU(Configuring the Hardware ) and FPGA(used as...

Hi all , Can any one tell me a generic pattern to designing an interface between MCU(Configuring the Hardware ) and FPGA(used as an accelerator). My initial thoughts are to have a dual port RAM implemented in FPGA and accessed as a memory mapped device from the MCU and used to configure the Hardware. Is this viable ? is this the norm? Are there any tutorials on the net that can help(...